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Article overview
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Phenomenology with Lattice NRQCD b Quarks | Brian Colquhoun
; Christine T. H. Davies
; Rachel J. Dowdall
; Jonna Koponen
; G. Peter Lepage
; Andrew T. Lytle
; | Date: |
5 Nov 2015 | Abstract: | The HPQCD collaboration has used radiatively-improved NonRelativistic QCD
(NRQCD) for $b$ quarks in bottomonium to determine the decay rate of $Upsilon$
and $Upsilon^prime$ mesons to leptons in lattice QCD. Using time-moments of
vector bottomonium current-current correlators, we are also able to determine
the $b$ quark mass in the $overline{mathrm{MS}}$ scheme. We use the same
NRQCD $b$ quarks and Highly Improved Staggered Quark (HISQ) light quarks --
with masses down to their physical values -- to give a complete picture of
heavy-light meson decay constants including those for vector mesons. We also
study the semileptonic $B
ightarrowpiell
u$ decay at zero recoil to show
that lattice QCD is consistent with the soft pion theorem for this decay:
$f_0(q^2_{mathrm{max}})=f_B/f_pi$ in the massless pion limit. Finally, we
present preliminary results for the $B_c
ightarrow eta_c ell
u$
semileptonic decay form factors. This is a showcase for the comparison of
results for NRQCD $b$ quarks with those from HISQ $b$ quarks (both with HISQ
$c$ quarks). We give the first 3-point results from our ’heavy HISQ’ programme,
which will allow us to improve the normalisation of NRQCD-HISQ currents for
other calculations. | Source: | arXiv, 1511.1852 | Services: | Forum | Review | PDF | Favorites |
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